Did you read the sour crop thread that wyorp rock shared in her reply? Or worm her? Do you have anyone to help you restrain the hen so you're able to stretch her neck out a little bit, open her beak and get a good look using a light? As far as food, how long has it been since she ate? Hydration is the most important thing, so you'd want to make sure she's hydrated before considering tubing feed into her. Is she drinking at all? How long has she had crop problems? Is she blocked and the contents have become soured or is she suffering from sour crop? You've already received some wonderful advice. I'm hoping your hen will be more comfortable very soon